The following pie-chart shows the study-...

The following pie-chart shows the study-time of different subjects of a student in a day. Study the pie-chart and answer the following questions

Instead of 10%, if the student spends 15% of study other subjects and the time is taken from the time scheduled to study mathematics and if he / she used to study 20 hours per day, then the difference of time for studying mathematics per day is :

30 minutes

45 minutes

1 hour

`1(1)/(2)` hours

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